The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 1994
Filed:
Feb. 03, 1993
Ira C Schwartz, Marina Del Rey, CA (US);
Orlando L Noche, Gardena, CA (US);
Keith Klein, Torrance, CA (US);
BP Chemicals (Hitco) Inc., Gardena, CA (US);
Abstract
This invention relates to an improved pack mixture composition useful for the formation of a SiC pack cementation coating for protecting a carbonaceous substrate from degradation at temperatures above about 800.degree. F. comprising: Si from about 15% to about 50% by weight of the total composition; B up to about 25% by weight of the total composition when present; SiO.sub.2 from about 0.01% to about 3% by weight of the total composition; and SiC from about 40% to about 85% by weight of the total composition. The invention also relates to a method for protecting a carbonaceous substrate from degradation at temperatures above about 800.degree. F. comprising: preparing a pack mixture composition of from about 15% to about 50% Si, up to about 25% B, from about 0.01% to about 3% SiO.sub.2 and from about 40% to about 85% SiC, all by weight of the total pack mixture composition; coating the carbonaceous substrate with release agent; surrounding the release agent-coated carbonaceous substrate with the pack mixture composition; and firing the carbonaceous substrate for a period of time sufficient to effectuate the formation of a protective SiC pack cementation coating on the carbonaceous substrate. The invention further relates to a cork release agent composition for providing the clean release of spent pack composition from a carbonaceous substrate.